MCP3002 datasheet(13/34 Pages) MICROCHIP

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DS21294D-page 13

MCP3002

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

Additional descriptions of the device pins follows.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Analog Inputs (CH0/CH1)

Analog inputs for channels 0 and 1 respectively. These

channels can programmed to be used as two

independent channels in single ended-mode or as a

single pseudo-differential input where one channel is

IN+ and one channel is IN-. See Section 5.0 “Serial

Communications”

for information on programming

the channel configuration.

3.2

Chip Select/Shutdown (CS/SHDN)

The CS/SHDN pin is used to initiate communication

with the device when pulled low and will end a

conversion and put the device in low power standby

when pulled high. The CS/SHDN pin must be pulled

high between conversions.

3.3

Serial Clock (CLK)

The SPI clock pin is used to initiate a conversion and to

clock out each bit of the conversion as it takes place.

See Section 6.2 “Maintaining Minimum Clock

Speed”

for constraints on clock speed.

3.4

Serial Data Input (DIN)

The SPI port serial data input pin is used to clock in

input channel configuration data.

3.5

Serial Data Output (DOUT)

The SPI serial data output pin is used to shift out the

results of the A/D conversion. Data will always change

on the falling edge of each clock as the conversion

takes place.

MCP3002

Symbol

Description

MSOP, PDIP, SOIC,

TSSOP

1CS/SHDN

Chip Select/Shutdown Input

CH0

Channel 0 Analog Input

CH1

Channel 1 Analog Input

4VSS

Ground

5DIN

Serial Data In

6DOUT

Serial Data Out

CLK

Serial Clock

8VDD/VREF

+2.7V to 5.5V Power Supply and Reference Voltage Input

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